NEC Express5800 series User Manual page 42

You can choose Write Back or Write Thru.
Write Policy
Write Back
Write Thru
Virtual Sizing
This feature is not available.
Add Capacity
Click on this option to add additional physical drive(s) to the specified logical drive. First
click on the drive icon for each physical drive to be added. Then click on the icon for the
logical drive to be added to. Then select [Add Capacity] from the [Logical Drv] menu.
Click on [OK] when prompted to confirm the new logical drive configuration. Select a
new RAID level. You can select any RAID level that is not grayed out. Click on [APPLY]
to complete the operation.
NOTES:
The physical drive must be in the READY state before it
can be added to a logical drive.
No operation can be started while a drive is being
reconstructed.
With Windows 2000, Add Capacity is available only for
basic disk, not for dynamic disk.
Description
The controller sends a data transfer completion signal to the
host when the controller cache has received all the data in a
transaction.
The controller sends a data transfer completion signal to the
host when the disk array has received all the data in a
transaction. This is the default setting. Write Thru has a data
security advantage over Write Back. Write Back has a
performance advantage over Write Thru.
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